diff --git a/pkgs/development/libraries/liblouis/default.nix b/pkgs/development/libraries/liblouis/default.nix
index f61fb775fbd..893704ddb18 100644
--- a/pkgs/development/libraries/liblouis/default.nix
+++ b/pkgs/development/libraries/liblouis/default.nix
@@ -12,13 +12,13 @@
 
 stdenv.mkDerivation rec {
   pname = "liblouis";
-  version = "3.20.0";
+  version = "3.21.0";
 
   src = fetchFromGitHub {
     owner = "liblouis";
     repo = "liblouis";
     rev = "v${version}";
-    sha256 = "sha256-DuMVs9cC0VnZg3E9GtZB8LYkp3Ybfzlv8vd4d1Muwyc=";
+    sha256 = "sha256-Hfn0dfXihtUfO3R+qJaetrPwupcIwblvi1DQdHCF1s8=";
   };
 
   outputs = [ "out" "dev" "man" "info" "doc" ];